why should we add well decayed organic matter and basal fertilizer to the soil before transplanting seedlings or grafted plants of perennial crop species?

Organic matter helps produce stable soil structures and adds nutrients to the soil. If the soil does not contain enough nutrients for optimum crop growth you need to add fertiliser. It is always worthwhilre to check the nutrient content of your soil by analysis before addin extra nutrients. If levels are not sufficient the crop does not grow as fast and returns will be reduced.